ASoC: soc-dai: add snd_soc_dai_compress_new()

Current ALSA SoC is directly using dai->driver->xxx,
thus, it has deep nested bracket, and it makes code unreadable.
This patch adds new snd_soc_dai_compress_new() and use it.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/87h87ehn1a.wl-kuninori.morimoto.gx@renesas.comSigned-off-by: Mark Brown <broonie@kernel.org>

include/sound/soc-dai.h

@@ -166,6 +166,8 @@ void snd_soc_dai_suspend(struct snd_soc_dai *dai);
 void snd_soc_dai_resume(struct snd_soc_dai *dai);
 int snd_soc_dai_probe(struct snd_soc_dai *dai);
 int snd_soc_dai_remove(struct snd_soc_dai *dai);
+int snd_soc_dai_compress_new(struct snd_soc_dai *dai,
+			     struct snd_soc_pcm_runtime *rtd, int num);
 
 struct snd_soc_dai_ops {
 	/*

sound/soc/soc-core.c

@@ -1545,15 +1545,16 @@ static int soc_probe_link_dais(struct snd_soc_card *card,
 			num = rtd->dai_link->id;
 	}
 
-	if (cpu_dai->driver->compress_new) {
-		/* create compress_device" */
-		ret = cpu_dai->driver->compress_new(rtd, num);
-		if (ret < 0) {
+	/* create compress_device if possible */
+	ret = snd_soc_dai_compress_new(cpu_dai, rtd, num);
+	if (ret != -ENOTSUPP) {
+		if (ret < 0)
 			dev_err(card->dev, "ASoC: can't create compress %s\n",
 					 dai_link->stream_name);
 		return ret;
 	}
-	} else if (!dai_link->params) {
+
+	if (!dai_link->params) {
 		/* create the pcm */
 		ret = soc_new_pcm(rtd, num);
 		if (ret < 0) {

sound/soc/soc-dai.c

@@ -379,3 +379,11 @@ int snd_soc_dai_remove(struct snd_soc_dai *dai)
 		return dai->driver->remove(dai);
 	return 0;
 }
+
+int snd_soc_dai_compress_new(struct snd_soc_dai *dai,
+			     struct snd_soc_pcm_runtime *rtd, int num)
+{
+	if (dai->driver->compress_new)
+		return dai->driver->compress_new(rtd, num);
+	return -ENOTSUPP;
+}